0_0_17228190_12623.cpp: In function 'void dfs(int)':
0_0_17228190_12623.cpp:77:21: error: reference to 'next' is ambiguous
for (i=head[u];i;i=next[i])
^
0_0_17228190_12623.cpp:10:51: note: candidates are: int next [200010]
int st[maxn],ed[maxn],d[maxn],len[maxn],val[maxn],next[maxn],b[maxn],head[maxn];
^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:61,
from 0_0_17228190_12623.cpp:5:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:184:5: note: template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
next(_ForwardIterator __x, typename
^
0_0_17228190_12623.cpp: In function 'void add(int, int)':
0_0_17228190_12623.cpp:88:5: error: reference to 'next' is ambiguous
next[++tot0]=head[u];head[u]=tot0;b[tot0]=v;
^
0_0_17228190_12623.cpp:10:51: note: candidates are: int next [200010]
int st[maxn],ed[maxn],d[maxn],len[maxn],val[maxn],next[maxn],b[maxn],head[maxn];
^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:66:0,
from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:61,
from 0_0_17228190_12623.cpp:5:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator_base_funcs.h:184:5: note: template<class _ForwardIterator> _ForwardIterator std::next(_ForwardIterator, typename std::iterator_traits<_Iter>::difference_type)
next(_ForwardIterator __x, typename
^
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